sgi-gru: add statistics to the GRU context management functions

Add statistics to the GRU context management functions.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 39 insertions, 0 deletions

diff --git a/drivers/misc/sgi-gru/gruprocfs.c b/drivers/misc/sgi-gru/gruprocfs.c
index 6d63a8d70f86..8724551aa55e 100644
--- a/drivers/misc/sgi-gru/gruprocfs.c
+++ b/drivers/misc/sgi-gru/gruprocfs.c
@@ -122,6 +122,30 @@ static ssize_t statistics_write(struct file *file, const char __user *userbuf,
 	return count;
 }
 
+static int mcs_statistics_show(struct seq_file *s, void *p)
+{
+	int op;
+	unsigned long total, count, max;
+	static char *id[] = {"cch_allocate", "cch_start", "cch_interrupt",
+		"cch_interrupt_sync", "cch_deallocate", "tgh_invalidate"};
+
+	for (op = 0; op < mcsop_last; op++) {
+		count = atomic_long_read(&mcs_op_statistics[op].count);
+		total = atomic_long_read(&mcs_op_statistics[op].total);
+		max = mcs_op_statistics[op].max;
+		seq_printf(s, "%-20s%12ld%12ld%12ld\n", id[op], count,
+			   count ? total / count : 0, max);
+	}
+	return 0;
+}
+
+static ssize_t mcs_statistics_write(struct file *file,
+			const char __user *userbuf, size_t count, loff_t *data)
+{
+	memset(mcs_op_statistics, 0, sizeof(mcs_op_statistics));
+	return count;
+}
+
 static int options_show(struct seq_file *s, void *p)
 {
 	seq_printf(s, "0x%lx\n", gru_options);
@@ -137,6 +161,7 @@ static ssize_t options_write(struct file *file, const char __user *userbuf,
 	if (copy_from_user
 	    (buf, userbuf, count < sizeof(buf) ? count : sizeof(buf)))
 		return -EFAULT;
+	buf[count - 1] = '\0';
 	if (!strict_strtoul(buf, 10, &val))
 		gru_options = val;
 
@@ -233,6 +258,11 @@ static int statistics_open(struct inode *inode, struct file *file)
 	return single_open(file, statistics_show, NULL);
 }
 
+static int mcs_statistics_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, mcs_statistics_show, NULL);
+}
+
 static int options_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, options_show, NULL);
@@ -257,6 +287,14 @@ static const struct file_operations statistics_fops = {
 	.release 	= single_release,
 };
 
+static const struct file_operations mcs_statistics_fops = {
+	.open 		= mcs_statistics_open,
+	.read 		= seq_read,
+	.write 		= mcs_statistics_write,
+	.llseek 	= seq_lseek,
+	.release 	= single_release,
+};
+
 static const struct file_operations options_fops = {
 	.open 		= options_open,
 	.read 		= seq_read,
@@ -285,6 +323,7 @@ static struct proc_entry {
 	struct proc_dir_entry *entry;
 } proc_files[] = {
 	{"statistics", 0644, &statistics_fops},
+	{"mcs_statistics", 0644, &mcs_statistics_fops},
 	{"debug_options", 0644, &options_fops},
 	{"cch_status", 0444, &cch_fops},
 	{"gru_status", 0444, &gru_fops},